[STORM-3649] fix logic error regarding storm.supervisor.medium.memory.grace.period.ms
diff --git a/storm-server/src/main/java/org/apache/storm/daemon/supervisor/BasicContainer.java b/storm-server/src/main/java/org/apache/storm/daemon/supervisor/BasicContainer.java
index 4db6f3f..5383d65 100644
--- a/storm-server/src/main/java/org/apache/storm/daemon/supervisor/BasicContainer.java
+++ b/storm-server/src/main/java/org/apache/storm/daemon/supervisor/BasicContainer.java
@@ -77,7 +77,7 @@
     protected final long mediumMemoryGracePeriodMs;
     protected volatile boolean exitedEarly = false;
     protected volatile long memoryLimitMb;
-    protected volatile long memoryLimitExceededStart;
+    protected volatile long memoryLimitExceededStart = -1;
 
     /**
      * Create a new BasicContainer.